hey, well RTM is abbreviated Release to Manufacturing, which is pretty much like using the full version.
yes it runs very good + faster than Vista & XP. And i didn't really need to install any drivers besides the GPU driver that's it. The requirements are extremely lower than Vista but a-bit higher than XP + i tried games on it and it runs really good, but it still got Direct X 10 installed though.
imo i reckon that you should + i formatted over Vista ultimate.